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WO2018141185A1 - 减压型倒流防止器 - Google Patents

减压型倒流防止器 Download PDF

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Publication number
WO2018141185A1
WO2018141185A1 PCT/CN2017/118999 CN2017118999W WO2018141185A1 WO 2018141185 A1 WO2018141185 A1 WO 2018141185A1 CN 2017118999 W CN2017118999 W CN 2017118999W WO 2018141185 A1 WO2018141185 A1 WO 2018141185A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
rocker
backflow preventer
valve seat
valve body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/118999
Other languages
English (en)
French (fr)
Inventor
霍达文
吴柏敏
梁建林
陈键明
何国豪
黎彪
潘庆祥
黄明亮
区家显
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Yongquan Valve Technology Co Ltd
Original Assignee
Guangdong Yongquan Valve Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Yongquan Valve Technology Co Ltd filed Critical Guangdong Yongquan Valve Technology Co Ltd
Priority to US16/335,247 priority Critical patent/US20190249778A1/en
Publication of WO2018141185A1 publication Critical patent/WO2018141185A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
    • F16K1/2007—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member specially adapted operating means therefor
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
    • E03F7/02—Shut-off devices
    • E03F7/04—Valves for preventing return flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
    • F16K1/2028—Details of bearings for the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
    • F16K1/2042—Special features or arrangements of the sealing
    • F16K1/205—Special features or arrangements of the sealing the sealing being arranged on the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/52—Means for additional adjustment of the rate of flow
    • F16K1/523—Means for additional adjustment of the rate of flow for limiting the maximum flow rate, using a stop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
    • F16K11/105—Three-way check or safety valves with two or more closure members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F16K15/033—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
    • F16K15/182—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism
    • F16K15/1821—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism for check valves with a hinged or pivoted closure member

Definitions

  • the present invention relates to the field of pipeline valve technology, and more particularly to a pressure reducing type backflow preventer.
  • the backflow preventer is used for pipes such as sewage treatment to prevent backflow of liquid flowing back to cause backflow pollution.
  • the backflow preventer is a valve device consisting of two separate check valves and a safety drain valve.
  • the existing check valve structure is too simple, and the resistance to water flow is very obvious.
  • the resistance of the check valve to the water flow increases linearly as the opening of the valve flap increases, and the safety drain valve frequently drains water when the pressure chambers of the backflow preventer generate less pressure fluctuations.
  • valve seat of the domestic check valve is basically made of metal.
  • the fixed connection between the parts and the parts must be made by traditional mechanical connection, such as threaded connection, the valve seat must be drilled and tapped, and then Each component is fixedly mounted in the valve seat by a threaded connection, which consumes material.
  • threaded connection such as threaded connection
  • Each component is fixedly mounted in the valve seat by a threaded connection, which consumes material.
  • the components and the valve seat repeatedly vibrate, and the components are prone to loosening.
  • the technical problem to be solved by the present invention is to provide a decompression type backflow preventer for the above-mentioned drawbacks of the prior art.
  • the technical solution adopted by the present invention to solve the technical problem thereof is to provide a pressure reducing type backflow preventer, comprising a valve body, two check valves having the same structure, and a drain valve; the valve body internally forms a cavity and a valve
  • the valve wall of the body has a water inlet, a water outlet and a water discharge port; the two check valves are fixedly installed in the valve body through the support member, respectively at the water inlet and the water outlet; the drain valve is installed outside the valve body
  • the check valve includes a valve seat, a valve flap, a rocker, and a double torsion spring; one side of the valve flap is hinged at an upper end of the valve seat, and the other side is mounted with a roller; the rocker One end is a fixed end, the other end is a free end, and the fixed end of the rocker is connected to the lower end of the valve seat through a pin shaft; the roller abuts on the rocker and slides between the fixed end of the rocker and the free end of
  • the free end of the rocker is provided with a hook portion.
  • a buckle hole is formed on the free end of the rocker.
  • one side of the valve disc on which the roller is mounted is provided with a limiting groove for limiting the movement of the rocker back hook.
  • the valve seat is provided with two supporting pieces for fixing the valve flap, and the valve flap is fixed between the two supporting pieces by a pivot;
  • the valve seat is a plastic piece, and the supporting piece is
  • the metal piece is integrally formed with the valve seat by using a plastic insert technology;
  • the limit hook is a metal piece, and the limit hook is integrally formed with the valve seat by using a plastic insert technology.
  • the valve flap is provided with a rubber sheet and a pressure plate, and the rubber sheet is fixed to the valve flap by bolts on the pressure plate.
  • the left and right sides of the valve seat extend outwardly with a boss for fixing the mounting support, the boss is provided with a fixing nut; the support member is connected with a stud, and the stud is sleeved with a locknut One end of the stud is screwed to the fixing nut, and the other end of the stud is screwed to the support member; the support member is fixedly installed in the valve body by adjusting the lock nut on the stud.
  • the bottom surface of the boss on the left and right sides of the valve seat has a gap with the inner wall of the valve body.
  • the side surfaces of the bosses on the left and right sides of the valve seat are in contact with the inner wall of the valve body to prevent the check valve from rotating and rotating in the valve body.
  • the fixing nut is a metal piece, and the fixing nut is integrally formed with the valve seat by using a plastic insert technology.
  • the top of the valve body is provided with a detachable valve cover.
  • the check valve in the preventer has a different swinging structure, so that the check valve can achieve better backflow prevention effect: on the one hand, when the valve flap is closed, there is enough between the valve seat and the valve flap. Sealing force. During the opening of the flap, the resistance of the check valve to the water flow decreases as the opening of the flap increases. On the other hand, regardless of the increase or decrease of the water flow, the roller of the check valve slides along the length of the rocker, and the rocker plays a certain guiding role, so that the opening of the valve flap is more stable.
  • plastic valve seat and metal support piece, metal hook and metal nut are formed by plastic insert technology at one time, no need to use bolt connection or other mechanical means to make each component fixedly mounted on the valve seat. And the installation is very firm, which solves the problem that the domestic valve seat is basically made of metal material, the fixed connection between the parts and components consumes time and materials; and the check valve is solved during the opening and closing process. Repeated vibration between the parts and the seat, the parts are prone to loosening.
  • the double torsion spring of the check valve is easy to install: the spring member of the conventional check valve structure is very cumbersome to install.
  • the present invention only needs to put the double torsion spring into the pin through the two limit hooks disposed at the lower end of the valve seat. On the shaft, then use a screwdriver to respectively twist the left and right twisting arms of the double torsion spring to the corresponding limit hook limit. This hooking method facilitates the installation and disassembly of the spring.
  • FIG. 1 is a schematic structural view of a decompression type backflow preventer and other pipes according to a preferred embodiment of the present invention
  • Figure 2 is a cross-sectional view of Figure 1;
  • FIG. 3 is a schematic structural view of a decompression type backflow preventer according to a preferred embodiment of the present invention.
  • Figure 4 is an enlarged plan view showing the area A of Figure 3;
  • Figure 5 is an enlarged plan view showing the area B of Figure 3;
  • Figure 6 is a schematic structural view of a check valve and a support member
  • Figure 7 is an enlarged schematic view of a region C in Figure 6;
  • Figure 8 is an enlarged schematic view of a region D in Figure 6;
  • Figure 9 is an enlarged schematic view of the area E in Figure 6;
  • Figure 10 is a structural schematic view showing the closed state of the check valve in accordance with a preferred embodiment of the present invention.
  • Figure 11 is a schematic view showing the structure of the check valve in a half-open state according to a preferred embodiment of the present invention.
  • Figure 12 is a structural schematic view showing the maximum opening state of the check valve according to the preferred embodiment of the present invention.
  • Figure 13 is a schematic structural view showing a state in which a check valve is opened in a preferred embodiment of the present invention
  • Figure 14 is a schematic view showing the operation of the check valve cleaning and replacing member of the present invention.
  • valve body 101, protruding position; 102, valve cover; 2, check valve; 201, valve seat; 2011, boss; 2012, pit; 202, valve flap; 2021, limit groove; 203, rocker; 2031, hook portion; 2032, buttonhole; 204, double torsion spring; 205, roller; 206, pin; 207, limit hook; 208, rubber sheet; 209, pressure plate; 210, support 3, drain valve; 4, support; 5, fixing nut; 6, stud; 7, lock nut; 8, clearance.
  • a pressure reducing type backflow preventer includes a valve body 1, two check valves 2 of the same structure, and a drain valve 3; a valve body is formed inside the valve body, and a valve body of the valve body is formed.
  • the wall has a water inlet, a water outlet and a water outlet; the two check valves are fixedly mounted in the valve body through the support member 4, respectively at the water inlet and the water outlet; the drain valve is installed outside the valve body, At the drain outlet;
  • the check valve 2 includes a valve seat 201, a valve flap 202, a rocker 203, and a double torsion spring 204; one side of the valve flap is hinged at an upper end of the valve seat, and the other side of the valve flap is mounted with a roller 205; One end of the rocker is a fixed end, and the other end is a free end, and the fixed end of the rocker is connected to the lower end of the valve seat through a pin 206; the roller abuts on the rocker and is at the fixed end of the rocker and the free end of the rocker Sliding between the two ends of the valve seat; the double torsion spring is disposed on the pin shaft
  • the middle twist arm is limited by the rocker.
  • the left and right twisting arms of the double torsion spring are limited by the limit hook at the lower end of the valve seat; the spring force of the double torsion spring acts on the rocker to make the valve flap normally closed.
  • the roller on the valve flap is rolled on the rocker by an external force to realize the opening of the valve flap.
  • the flow of water flows from the left to the right, and the two valves are flushed through the decompression type backflow preventer of the present invention.
  • the two check valve flaps are closed to prevent backflow, and the liquid in the valve body cavity is from below.
  • the drain valve flows away.
  • the free end of the rocker is provided with a hook portion 2031.
  • the hook portion is used to clamp the roller, so that the valve flap cannot be further opened, and the limit function is performed.
  • the first advantage of the decompression type backflow preventer of the present invention is that the swinging structure is different in the check valve, so that the preventer achieves better backflow prevention effect: on the one hand, due to the structure in which the double torsion spring interacts with the rocker, Ensure that there is sufficient sealing between the seat and the disc when the disc is closed. During the opening of the flap, the resistance of the check valve to the water flow decreases as the opening of the flap increases. On the other hand, regardless of the increase or decrease of the water flow, the roller of the check valve slides along the length of the rocker, and the rocker plays a certain guiding role, so that the opening of the valve flap is more stable.
  • the left and right sides of the valve seat of each check valve extend outwardly with bosses 2011 for fixing the mounting support members, each of which Two fixing nuts 5 are arranged on the boss; there are two supporting members of the invention, each of which is connected with a stud 6 , and the stud is sleeved with a lock nut 7; the support member is internally threaded.
  • One end of the stud is screwed to the fixing nut, and the other end of the stud is screwed to the support member; the support member is fixedly installed in the valve body by adjusting the lock nut on the stud.
  • the side of the boss is in contact with the inner wall of the valve body, so that the check valve cannot swing side by side.
  • a certain gap 8 is left between the bottom surface of the boss on the left and right sides of the valve seat and the inner wall of the valve body, so that when the worker removes the check valve, the slot can be inserted into the gap by using a flat-blade screwdriver, and the entire check valve is used. It is easy to disassemble, as shown in Figure 4-5.
  • the top of the valve body is provided with a detachable valve cover 102.
  • the installation and disassembly process of the check valve of the present invention is as follows:
  • the check valve When the check valve is installed, first place a check valve into the valve body at the water outlet, and then put another check valve into the valve body at the water inlet. Screw the stud into the retaining nut of the check valve at the water inlet, and then push the support outward to the check valve seat at the water outlet by tightening the locknut on the stud.
  • the two check valves are fixedly installed in the valve body to ensure that the check valve is in close contact with each other under frequent vibration conditions and will not loosen.
  • a button hole 2032 is formed in the free end of the rocker of the check valve.
  • a side of the valve disc on which the roller is mounted is provided with a limiting groove 2021 for restricting the movement of the rocker back hook.
  • the operator can insert the button hole of the rocker into a protruding position (the protruding position 101 can be set on the valve body 1 or Set in the convenient cleaning position), then force the valve clockwise to the valve seat, open the rocker, and then hook the hook of the rocker into the limit groove of the roller and the valve flap, so that the valve flap is always Open state, easy to clean and replace parts.
  • the valve flap is provided with a rubber sheet 208 and a pressure plate 209, and the rubber sheet is fixed on the valve flap by bolts on the pressure plate.
  • the rubber sheet of the check valve is generally easy to wear. When the worker changes it, the bolt on the pressure plate is directly twisted, and the rubber sheet can be replaced.
  • the double torsion spring of the check valve of the present invention is easy to install, and the spring member of the conventional check valve structure is very cumbersome to install.
  • the present invention only needs to insert the double torsion spring through the two limit hooks disposed at the lower end of the valve seat. On the pin shaft, then use a screwdriver to respectively push the two torsion arms of the double torsion spring to the corresponding limit hook limit. This hooking method facilitates the installation and disassembly of the spring.
  • the valve seat is provided with two supporting pieces 210 for fixing the valve flap, and the valve flap is fixed between the two supporting pieces by a pivot; the valve seat is a plastic part.
  • the support piece, the limit hook 207 and the fixing nut 5 are all metal parts, and the support piece, the limit hook and the fixing nut are integrally formed with the valve seat by using the plastic insert technology.
  • the invention adopts the plastic insert technology as the processing technology known in the prior art, and is applied to the check valve of the invention to obtain better effects.
  • the fourth advantage of the decompression type backflow preventer of the present invention is that the plastic valve seat and the metal piece, the metal hook and the metal nut are formed in one time by using the plastic insert technology, and the parts are not required to be fixed by bolting or other mechanical means.
  • the domestic valve seat is basically made of metal material, the fixed connection between the parts and components consumes time and materials; and the check valve is solved.
  • the components and the valve seat repeatedly vibrate, and the components are prone to loosening.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Check Valves (AREA)

Abstract

公开了减压型倒流防止器，包括阀体（1）、两个结构相同的止回阀（2）以及泄水阀（3）；阀体内部形成腔体，阀体的阀壁上带有进水口、出水口、泄水口；两个止回阀均通过支撑件（4）固定安装在阀体内，分别位于进水口处和出水口处；泄水阀安装在阀体外，位于泄水口处；止回阀包括阀座（201）、阀瓣（202）、摇杆（203）、双扭簧（204）；阀瓣的一侧铰接在阀座的上端，另一侧安装有滚轮（205）；摇杆通过销轴（206）连接在阀座的下端；滚轮抵接于摇杆上，并在摇杆上滑动；双扭簧套设在销轴上；双扭簧的弹簧力作用于摇杆上使阀瓣处于常闭状态，通过外力使阀瓣上的滚轮在摇杆上滚动，实现阀瓣的开启。由于止回阀的双扭簧与摇杆结构，使该防止器达到更好防流效果。

Description

减压型倒流防止器 技术领域
本发明涉及管道阀技术领域，更具体地说，涉及一种减压型倒流防止器。
背景技术
倒流防止器用于污水处理等管道，防止流向的液体倒流造成回流污染。倒流防止器是由两个隔开的止回阀和一个安全泄水阀组成组合而成的一个阀门装置。现有的止回阀结构过于简易，对水流的阻力十分明显。止回阀对水流的阻力随阀瓣的开度增大而线性增大，并且当倒流防止器的各压力腔产生较小压力波动时，安全泄水阀频繁泄水。
另外，现国内止回阀的阀座基本都是采用金属材质，零部件与零部件之间的固定连接方式必须采用传统的机械连接，如螺纹连接，阀座处须钻孔攻螺纹，再将各零部件通过螺纹连接固定安装在阀座内，耗时耗材料。并且止回阀在启闭过程中，各零部件与阀座之间反复震动，部件容易出现松动。
发明内容
本发明要解决的技术问题在于，针对现有技术的上述缺陷，提供一种减压型倒流防止器。
本发明解决其技术问题所采用的技术方案是：提供一种减压型倒流防止器，包括阀体、两个结构相同的止回阀以及泄水阀；所述 阀体内部形成腔体，阀体的阀壁上带有进水口、出水口、泄水口；两个止回阀均通过支撑件固定安装在阀体内，分别位于进水口处和出水口处；所述泄水阀安装在阀体外，位于泄水口处；所述止回阀包括阀座、阀瓣、摇杆、双扭簧；所述阀瓣的一侧铰接在阀座的上端，另一侧安装有滚轮；所述摇杆一端为固定端，另一端为自由端，摇杆固定端通过销轴连接在阀座的下端；所述滚轮抵接于摇杆上，并在摇杆固定端与摇杆自由端之间滑动；所述阀座的下端设置有两个限位挂钩；所述双扭簧套设在所述销轴上，双扭簧左右对称布置在摇杆的两侧，双扭簧的中间扭臂由摇杆限位，双扭簧的左右两个伸出的扭臂由阀座下端的限位挂钩限位；双扭簧的弹簧力作用于摇杆上使阀瓣处于常闭状态，通过外力使阀瓣上的滚轮在摇杆上滚动，实现阀瓣的开启。
优选地，所述摇杆自由端设有回钩部。
优选地，所述摇杆自由端上开设有扣孔。
优选地，所述阀瓣安装有滚轮的一侧设有用于限制摇杆回钩部活动的限位凹槽。
优选地，所述阀座上设置有两个用于固定阀瓣的支片，所述阀瓣通过枢轴固定在两个支片之间；所述阀座为塑料件，所述支片为金属件，所述支片采用塑料嵌件技术与阀座一体成型；所述限位挂钩为金属件，所述限位挂钩采用塑料嵌件技术与阀座一体成型。
优选地，所述阀瓣上设有橡胶片和压板，所述橡胶片通过压板 上的螺栓固定在阀瓣上。
优选地，所述阀座左右两侧向外延伸有用于固定安装支撑件的凸台，凸台上设置有固定螺母；所述支撑件上连接有螺柱，螺柱上套设有防松螺母；螺柱一端与固定螺母螺纹连接，螺柱另一端与支撑件螺纹连接；支撑件通过调节螺柱上的防松螺母以使两个止回阀固定安装在阀体内。
优选地，所述阀座左右两侧的凸台底面与阀体内壁留有间隙。
优选地，所述阀座左右两侧的凸台侧面与阀体内壁相抵触，以防止止回阀在阀体内旋转转动。
优选地，所述固定螺母为金属件，所述固定螺母采用塑料嵌件技术与阀座一体成型。
优选地，所述阀体顶部设置有可拆卸的阀盖。
实施本发明的减压型倒流防止器，具有以下有益效果：
(1)防止器内的止回阀具有不一样的旋启结构，使止回阀达到更好防止倒流效果：一方面，保证阀瓣在关闭状态时，阀座与阀瓣之间有足够的密封力。在阀瓣的开启过程中，止回阀对水流的阻力随阀瓣的开度增大而不断减小。另一方面，不管在水流增大或减少，该止回阀的滚轮沿着摇杆的长度方向滑动，摇杆起一定的导向作用，使得阀瓣的开启更加平稳。
(2)止回阀的便于安装拆卸：止回阀安装时，先将一个止回阀套入位于出水口处的阀体内，再将另一个止回阀套入位于进水口处 的阀体内。将螺柱旋紧在位于进水口处的止回阀的固定螺母内，再通过旋紧螺柱上的防松螺母，将支撑件向外推至与位于出水口处的止回阀阀座的凹坑上，使两止回阀固定安装在阀体内，保证止回阀在频繁震动的工况下，零部件之间紧密接触，不会松动。
对倒流防止器的零部件进行拆卸更换时，无需将整个装置拆卸下来，只需先把阀盖拆卸后，拧松阀腔内的防松螺母，将支撑件推离位于出水口处的止回阀的阀座，再用一字螺丝刀将止回阀撬出来即可。
(3)方便在线更换部件和清洗：对止回阀进行清洗和零部件更换时，由于双扭簧作用于摇杆的作用力很大，操作人员无法用手直接将摇杆撬开。因此通过所述摇杆自由端上开设的扣孔，操作人员可将摇杆的扣孔套入阀体的突出位上，然后向阀座顺时针发力，将摇杆撬开，再将摇杆的回钩部卡在滚轮与阀瓣的限位凹槽内，使阀瓣处于常开状态，方便零部件的清洗和更换。
(4)采用塑料嵌件技术：塑料阀座与金属支片、金属挂钩和金属螺母采用塑料嵌件技术一次成型，不需要使用螺栓连接或其他机械方式使各零部件固定安装在阀座上，并且安装十分牢固，解决了现国内的阀座基本都是采用金属材质，零部件与零部件之间的固定连接方式耗时耗材料的问题；并且解决了止回阀在启闭过程中，各零部件与阀座之间反复震动，部件容易出现松动的问题。
(5)止回阀的双扭簧便于安装：传统的止回阀结构的弹簧件安装十分繁琐，本发明通过设置在阀座下端的两个限位挂钩，只需要将双扭簧套入销轴上，然后用螺丝刀分别将双扭簧左右两个伸出的 扭臂撬至对应的限位挂钩限位上即可，该挂钩方式方便弹簧的安装拆卸。
附图说明
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1是本发明较佳实施例的减压型倒流防止器与其他管道的结构示意图；
图2是图1的剖视图；
图3是本发明较佳实施例的减压型倒流防止器的结构示意图；
图4是图3中A区域的俯视放大示意图；
图5是图3中B区域的俯视放大示意图；
图6是止回阀与支撑件的结构示意图；
图7是图6中C区域的放大示意图；
图8是图6中D区域的放大示意图；
图9是图6中E区域的放大示意图；
图10是本发明较佳实施例的止回阀关闭状态的结构示意图；
图11是本发明较佳实施例的止回阀半开启状态的结构示意图；
图12是本发明较佳实施例的止回阀最大开启状态的结构示意图；
图13是本发明较佳实施例的止回阀开启极限状态的结构示意图；
图14是本发明的止回阀清洗更换部件的操作过程示意图；
其中，1、阀体；101、突出位；102、阀盖；2、止回阀；201、 阀座；2011、凸台；2012、凹坑；202、阀瓣；2021、限位凹槽；203、摇杆；2031、回钩部；2032、扣孔；204、双扭簧；205、滚轮；206、销轴；207、限位挂钩；208、橡胶片；209、压板；210、支片；3、泄水阀；4、支撑件；5、固定螺母；6、螺柱；7、防松螺母；8、间隙。
具体实施方式
下面，结合附图以及具体实施方式，对本发明做进一步描述：
如图1-14所示，一种减压型倒流防止器，包括阀体1、两个结构相同的止回阀2以及泄水阀3；所述阀体内部形成腔体，阀体的阀壁上带有进水口、出水口、泄水口；两个止回阀均通过支撑件4固定安装在阀体内，分别位于进水口处和出水口处；所述泄水阀安装在阀体外，位于泄水口处；
所述止回阀2包括阀座201、阀瓣202、摇杆203、双扭簧204；所述阀瓣的一侧铰接在阀座的上端，阀瓣的另一侧安装有滚轮205；所述摇杆一端为固定端，另一端为自由端，摇杆固定端通过销轴206连接在阀座的下端；所述滚轮抵接于摇杆上，并在摇杆固定端与摇杆自由端之间滑动；所述阀座的下端设置有两个限位挂钩207；所述双扭簧套设在所述销轴上，双扭簧左右对称布置在摇杆的两侧，双扭簧的中间扭臂由摇杆限位，双扭簧的左右两个伸出的扭臂由阀座下端的限位挂钩限位；双扭簧的弹簧力作用于摇杆上使阀瓣处于常闭状态，通过外力使阀瓣上的滚轮在摇杆上滚动，实现阀瓣的开启。设置有两个止回阀，位于出水口处的止回阀，其双扭簧的弹力 比位于进水口的止回阀要大。
如图1-2所示，本发明减压型倒流防止器的工作过程如下：
水流从左边流向右边，冲开两个阀门通过本发明的减压型倒流防止器，当水流不大可能出现倒流时，两个止回阀阀瓣关闭，防止倒流，阀体腔内液体从下方的泄水阀流走。泄水阀上有弹簧，正常工况下弹簧使泄压阀关闭，当腔体内产生回流时，使泄水阀打开，液体从下方流走。
作为优选方案，所述摇杆自由端设有回钩部2031。当阀瓣开启到极限位置时，该回钩部用于卡紧滚轮，使阀瓣无法进一步打开，起到限位作用。
如图10-13所示，当阀瓣在关闭状态时，双扭簧的弹簧力作用于摇杆上，使阀瓣的滚轮抵压在摇杆上，保证阀瓣在关闭状态时，阀座与阀瓣之间有足够的密封力；当水流增大，阀瓣的开启度增大，使阀瓣上的滚轮从摇杆固定端滑向摇杆自由端，摇杆与滚轮的接触点随阀瓣的开启度增大而不断变化，摇杆对阀瓣作用力力臂不断增大，使得阀瓣在开启过程中，阀瓣对水流的阻力不断减小；当阀瓣开启到极限位置时，摇杆的回钩部卡紧滚轮，使阀瓣无法进一步打开。
本发明减压型倒流防止器的第一个优点在于止回阀内不一样的旋启结构，使防止器达到更好防止倒流效果：一方面，由于双扭簧与摇杆相互作用的结构，保证阀瓣在关闭状态时，阀座与阀瓣之间 有足够的密封力。在阀瓣的开启过程中，止回阀对水流的阻力随阀瓣的开度增大而不断减小。另一方面，不管在水流增大或减少，该止回阀的滚轮沿着摇杆的长度方向滑动，摇杆起一定的导向作用，使得阀瓣的开启更加平稳。
本发明减压型倒流防止器的第二个优点在于止回阀的便于安装拆卸：
如图3、6所示，为了使两个止回阀能够稳固的安装在阀体内，每个止回阀的阀座左右两侧向外延伸有用于固定安装支撑件的凸台2011，每个凸台上设置有两个固定螺母5；本发明的支撑件有两个，每个支撑件上连接有螺柱6，螺柱上套设有防松螺母7；支撑件内设有内螺纹，螺柱一端与固定螺母螺纹连接，螺柱另一端与支撑件螺纹连接；支撑件通过调节螺柱上的防松螺母以使两个止回阀固定安装在阀体内。凸台侧面与阀体内壁相接触，使止回阀无法左右旋转摇摆。
作为进一步优选方案，所述阀座左右两侧的凸台底面与阀体内壁留有一定的间隙8，方便工人拆卸止回阀时，可以用一字螺丝刀插入该间隙处，将整个止回阀撬出来，拆卸方便，如图4-5所示。
所述阀体顶部设置有可拆卸的阀盖102。
本发明止回阀的安装拆卸过程如下：
止回阀安装时，先将一个止回阀套入位于出水口处的阀体内，再将另一个止回阀套入位于进水口处的阀体内。将螺柱旋紧在位于 进水口处的止回阀的固定螺母内，再通过旋紧螺柱上的防松螺母，将支撑件向外推至与位于出水口处的止回阀阀座的凹坑2012上，使两止回阀固定安装在阀体内，保证止回阀在频繁震动的工况下，零部件之间紧密接触，不会松动。
对倒流防止器的零部件进行拆卸更换时，无需将整个装置拆卸下来，只需先把阀盖拆卸后，拧松阀腔内的防松螺母，将支撑件推离位于出水口处的止回阀的阀座，再用一字螺丝刀将止回阀撬出来即可。
本发明减压型倒流防止器的第三个优点在于方便在线更换部件和清洗：
在止回阀的摇杆自由端上开设有扣孔2032。阀瓣安装有滚轮的一侧设有用于限制摇杆回钩部活动的限位凹槽2021。对防止器内的止回阀进行清洗和零部件更换时，由于双扭簧作用于摇杆的作用力很大，操作人员无法用手直接将摇杆撬开。因此通过所述摇杆自由端上开设的扣孔，如图14所示，操作人员可将摇杆的扣孔套入一个突出位上(该突出位101可以设置在阀体1上，也可以设置在方便清洗的位置上)，然后向阀座顺时针发力，将摇杆撬开，再将摇杆的回钩部卡在滚轮与阀瓣的限位凹槽内，使阀瓣处于常开状态，方便零部件的清洗和更换。所述阀瓣上设有橡胶片208和压板209，所述橡胶片通过压板上的螺栓固定在阀瓣上。止回阀的橡胶片一般都是容易磨损件，工人对其跟换时，直接扭开压板上的螺栓，对橡胶片进 行更换即可。
另外，本发明止回阀的双扭簧便于安装，传统的止回阀结构的弹簧件安装十分繁琐，本发明通过设置在阀座下端的两个限位挂钩，只需要将双扭簧套入销轴上，然后用螺丝刀分别将双扭簧左右两个伸出的扭臂撬至对应的限位挂钩限位上即可，该挂钩方式方便弹簧的安装拆卸。
如图6-9所示，所述阀座上设置有两个用于固定阀瓣的支片210，所述阀瓣通过枢轴固定在两个支片之间；所述阀座为塑料件，所述支片、限位挂钩207、固定螺母5均为金属件，所述支片、限位挂钩以及固定螺母采用塑料嵌件技术均与阀座一体成型。本发明采用塑料嵌件技术为现有技术中已知的加工技术，应用于本发明的止回阀中取得较好的效果。
本发明减压型倒流防止器的第四个优点在于塑料阀座与金属支片、金属挂钩和金属螺母采用塑料嵌件技术一次成型，不需要使用螺栓连接或其他机械方式使各零部件固定安装在阀座上，并且安装十分牢固，解决了现国内的阀座基本都是采用金属材质，零部件与零部件之间的固定连接方式耗时耗材料的问题；并且解决了止回阀在启闭过程中，各零部件与阀座之间反复震动，部件容易出现松动的问题。
对本领域的技术人员来说，可根据以上描述的技术方案以及构思，做出其它各种相应的改变以及形变，而所有的这些改变以及形变 都应该属于本发明权利要求的保护范围之内。

Claims (11)

  1. 减压型倒流防止器，其特征在于，包括阀体、两个结构相同的止回阀以及泄水阀；所述阀体内部形成腔体，阀体的阀壁上带有进水口、出水口、泄水口；两个止回阀均通过支撑件固定安装在阀体内，分别位于进水口处和出水口处；所述泄水阀安装在阀体外，位于泄水口处；所述止回阀包括阀座、阀瓣、摇杆、双扭簧；所述阀瓣的一侧铰接在阀座的上端，另一侧安装有滚轮；所述摇杆一端为固定端，另一端为自由端，摇杆固定端通过销轴连接在阀座的下端；所述滚轮抵接于摇杆上，并在摇杆固定端与摇杆自由端之间滑动；所述阀座的下端设置有两个限位挂钩；所述双扭簧套设在所述销轴上，双扭簧左右对称布置在摇杆的两侧，双扭簧的中间扭臂由摇杆限位，双扭簧的左右两个伸出的扭臂由阀座下端的限位挂钩限位；双扭簧的弹簧力作用于摇杆上使阀瓣处于常闭状态，通过外力使阀瓣上的滚轮在摇杆上滚动，实现阀瓣的开启。
  2. 根据权利要求1所述的减压型倒流防止器，其特征在于，所述摇杆自由端设有回钩部。
  3. 根据权利要求1所述的减压型倒流防止器，其特征在于，所述摇杆自由端上开设有扣孔。
  4. 根据权利要求1所述的减压型倒流防止器，其特征在于，所述阀瓣安装有滚轮的一侧设有用于限制摇杆回钩部活动的限位凹槽。
  5. 根据权利要求1所述的减压型倒流防止器，其特征在于，所 述阀座上设置有两个用于固定阀瓣的支片，所述阀瓣通过枢轴固定在两个支片之间；所述阀座为塑料件，所述支片为金属件，所述支片采用塑料嵌件技术与阀座一体成型；所述限位挂钩为金属件，所述限位挂钩采用塑料嵌件技术与阀座一体成型。
  6. 根据权利要求1所述的减压型倒流防止器，其特征在于，所述阀瓣上设有橡胶片和压板，所述橡胶片通过压板上的螺栓固定在阀瓣上。
  7. 根据权利要求1所述的减压型倒流防止器，其特征在于，所述阀座左右两侧向外延伸有用于固定安装支撑件的凸台，凸台上设置有固定螺母；所述支撑件上连接有螺柱，螺柱上套设有防松螺母；螺柱一端与固定螺母螺纹连接，螺柱另一端与支撑件螺纹连接；支撑件通过调节螺柱上的防松螺母以使两个止回阀固定安装在阀体内。
  8. 根据权利要求7所述的减压型倒流防止器，其特征在于，所述阀座左右两侧的凸台底面与阀体内壁留有间隙。
  9. 根据权利要求7所述的减压型倒流防止器，其特征在于，所述阀座左右两侧的凸台侧面与阀体内壁相抵触，以防止止回阀在阀体内旋转转动。
  10. 根据权利要求7所述的减压型倒流防止器，其特征在于，所述固定螺母为金属件，所述固定螺母采用塑料嵌件技术与阀座一体成型。
  11. 根据权利要求1所述的减压型倒流防止器，其特征在于，所述阀体顶部设置有可拆卸的阀盖。
PCT/CN2017/118999 2017-02-06 2017-12-27 减压型倒流防止器 Ceased WO2018141185A1 (zh)

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106594325B (zh) * 2017-02-06 2018-11-20 广东永泉阀门科技有限公司 减压型倒流防止器
CN108458144B (zh) * 2018-04-25 2024-09-10 广东永泉阀门科技有限公司 一种通用泄水阀
CN110345282A (zh) * 2019-06-20 2019-10-18 陈炯亮 一种减压型倒流防止器
CN110541816A (zh) * 2019-09-23 2019-12-06 睿控节能技术服务(深圳)有限公司 蝶形双瓣单向阀逆阻装置
CN110735951B (zh) * 2019-10-30 2025-08-08 南京协威机械有限公司 防火止回阀
CN112113007B (zh) * 2020-09-16 2022-06-07 盐城市精工阀门有限公司 一种自清理式高效逆止阀
CN112815118A (zh) * 2021-03-22 2021-05-18 上海一核阀门股份有限公司 一种旋启式止回阀的阀瓣安装结构
US11976736B2 (en) * 2021-07-20 2024-05-07 Acorn Engineering Company, Inc. Eccentric backflow preventer
CN113933047B (zh) * 2021-10-15 2023-11-14 江苏卡一阀门制造有限公司 一种升降式止回阀体试验装置
CN115095694B (zh) * 2022-07-05 2025-07-01 江苏圣泰阀门有限公司 压力密封内挂支架式止回阀

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5711341A (en) * 1997-02-25 1998-01-27 Conbraco Industries, Inc. Swing-type check valve assembly retained within a valve housing by abutting engagement with a valve cover and a port of the valve housing
US5794655A (en) * 1997-02-25 1998-08-18 Conbraco Industries, Inc. Swing-type check valve assembly having an integrated valve seat and valve housing cover
CN2442057Y (zh) * 2000-09-05 2001-08-08 南海市九江永兴阀门制造有限公司 倒流防止器
CN204828785U (zh) * 2015-05-20 2015-12-02 天津市塘沽沃特斯阀门有限公司 一种安全型节水倒流防止器
CN105927767A (zh) * 2016-07-28 2016-09-07 广东永泉阀门科技有限公司 一种新型低阻力倒流防止器
CN106594325A (zh) * 2017-02-06 2017-04-26 广东永泉阀门科技有限公司 减压型倒流防止器
CN206572026U (zh) * 2017-02-06 2017-10-20 广东永泉阀门科技有限公司 减压型倒流防止器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893654A (en) * 1988-07-08 1990-01-16 Feuz John G Double check valve backflow preventer assembly
US5046525A (en) * 1990-06-15 1991-09-10 Ames Company, Inc. Differential loading fluid check valve
US5584315A (en) * 1995-12-18 1996-12-17 Ames Company, Inc. Check valve assembly and method for mounting and installing check valves within a housing
US6443181B1 (en) * 2000-12-28 2002-09-03 Hunter Innovations, Inc. Backflow prevention apparatus
US6648013B1 (en) * 2001-06-20 2003-11-18 Watts Industries, Inc. Check valve having variable opening-force threshold
AT510942B1 (de) * 2011-01-12 2013-05-15 Praher Kunststofftechnik Gmbh Rückschlagklappe
JP6017798B2 (ja) * 2012-02-23 2016-11-02 フタバ産業株式会社 排気流路用弁装置
US8887756B2 (en) * 2012-12-04 2014-11-18 Douglas Hunter Powell Shutoff valve in backflow prevention device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5711341A (en) * 1997-02-25 1998-01-27 Conbraco Industries, Inc. Swing-type check valve assembly retained within a valve housing by abutting engagement with a valve cover and a port of the valve housing
US5794655A (en) * 1997-02-25 1998-08-18 Conbraco Industries, Inc. Swing-type check valve assembly having an integrated valve seat and valve housing cover
CN2442057Y (zh) * 2000-09-05 2001-08-08 南海市九江永兴阀门制造有限公司 倒流防止器
CN204828785U (zh) * 2015-05-20 2015-12-02 天津市塘沽沃特斯阀门有限公司 一种安全型节水倒流防止器
CN105927767A (zh) * 2016-07-28 2016-09-07 广东永泉阀门科技有限公司 一种新型低阻力倒流防止器
CN106594325A (zh) * 2017-02-06 2017-04-26 广东永泉阀门科技有限公司 减压型倒流防止器
CN206572026U (zh) * 2017-02-06 2017-10-20 广东永泉阀门科技有限公司 减压型倒流防止器

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